配置文件 AndroidManifest.xml 如下

Version:1.0StartHTML:000000243

EndHTML:000019067

StartFragment:000007811

EndFragment:000018976

StartSelection:000007815

EndSelection:000018966

SourceURL:https://github.com/lqr41710085/App1/blob/master/app/src/main/AndroidManifest.xml

xmlns:dist="http://schemas.android.com/apk/distribution"

package="com.example.app1">

android:allowBackup="true"

android:icon="@mipmap/ic_launcher"

android:label="@string/app_name"

android:roundIcon="@mipmap/ic_launcher_round"

android:supportsRtl="true"

android:theme="@style/AppTheme">

android:name=".MainActivity"

android:label="@string/app_name"

android:theme="@style/AppTheme.NoActionBar">

连接网络：

publiccpublicclassMainActivityextendsAppCompatActivityimplementsRunnable{lassMainActivityextendsAppCompatActivityimplementsRunnable{

doubledol,eur,jap,hk;

TextViewedit,text;

privatestaticfinalStringTAG="MainActivity";

SharedPreferencessp;

SharedPreferences.Editoreditor;

Handlerhandler;

doubledol,eur,jap,hk;

TextViewedit,text;

privatestaticfinalStringTAG="MainActivity";

SharedPreferencessp;

SharedPreferences.Editoreditor;

Handlerhandler;

@Override

publicvoidrun() {//获取网络数据必须另建一个线程

Documentdoc=null;

Bundlebd=newBundle();

try{

Stringurl="https://www.usd-cny.com/bankofchina.htm";

doc=Jsoup.connect(url).get();

//Log.i(TAG,"hhhhhdoc:"+doc.title());

Elementstables=doc.getElementsByTag("table");

Elementtable=tables.first();

Elementstds=table.getElementsByTag("td");

Elementsps=doc.getElementsByTag("p");

Elementp=ps.get(0);

bd.putString("time",p.text());

//Log.i(TAG,"hhhh"+p.text());//获取时间装入bundle

for(inti=0;i

Elementtd1=tds.get(i);

Elementtd2=tds.get(i+5);

Stringname=td1.text();

Stringrate=td2.text();

if(name.equals("美元")||name.equals("日元")||name.equals("欧元")||name.equals("港币")){

floatv=100f/Float.parseFloat(rate);

bd.putFloat(name,v);

//Log.i(TAG,name+"hhhhh: "+v+"\n");

}

}

}catch(IOExceptione) {

e.printStackTrace();

}

Messagemsg=handler.obtainMessage(4);

msg.obj=bd;

handler.sendMessage(msg);

//Log.i(TAG,"hhhhsend");

}

privateStringinputStream2String(InputStreaminputStream)throwsIOException{

Stringstr="";

BufferedReaderreader=newBufferedReader(newInputStreamReader(inputStream,"gb2312"));

StringBuffersb=newStringBuffer();

while((str=reader.readLine())!=null){

Log.i(TAG,"in2str:"+str);

sb.append(str).append("\n");

}

returnsb.toString();

}

@Override

protectedvoidonCreate(BundlesavedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

Threadt=newThread(this);

t.start();

sp=this.getSharedPreferences("rate",MODE_PRIVATE);

handler=newHandler(){

publicvoidhandleMessage(Messagemsg){

if(msg.what==4){

Bundlebd2=(Bundle)msg.obj;

//判断时间是否与上次写入时间相同，不同则更新，相同则为同一天，不更新

Stringlasttime=sp.getString("time","0000-00-00");

Stringtime=bd2.get("time").toString().substring(12,22);

Log.i(TAG,lasttime+"hhhh"+time);

if(!time.equals(lasttime)){

editor=sp.edit();

editor.putFloat("dol",bd2.getFloat("美元"));

editor.putFloat("eur",bd2.getFloat("欧元"));

editor.putFloat("jap",bd2.getFloat("日元"));

editor.putFloat("hk",bd2.getFloat("港币"));

editor.putString("time",time);

editor.apply();

Log.i(TAG,"hhh已更新"+bd2.toString());

}

else

Log.i(TAG,"同一天，不更新hhhh");

}

super.handleMessage(msg);

}

};

dol=sp.getFloat("dol",0.0f);

eur=sp.getFloat("eur",0.0f);

jap=sp.getFloat("jap",0.0f);

hk=sp.getFloat("hk",0.0f);

/*dol=0.147;

eur=0.125;

jap=15.372;

hk=1.149;

*/

}

//在xml中btn绑定事件，四个按钮可以绑定一个事件，再依次判断

publicvoidbtn(Viewbtn){

edit=findViewById(R.id.editText);

text=findViewById(R.id.textView3);

if(edit.getText().toString().equals("")){

Toast.makeText(this,"pls enter a number",Toast.LENGTH_SHORT).show();

}

elseif(btn.getId()==R.id.button){

doublen=Double.parseDouble(edit.getText().toString());

n=n*dol;

Strings="after transform"+String.format("%.4f",n).toString()+"美元";

text.setText(s);

}

elseif(btn.getId()==R.id.button2){

doublen2=Double.parseDouble(edit.getText().toString());

n2=n2*eur;

Strings2="after transform"+String.format("%.2f",n2).toString()+"欧元";

text.setText(s2);

}

elseif(btn.getId()==R.id.button3){

doublen3=Double.parseDouble(edit.getText().toString());

n3=n3*jap;

Strings3="after transform"+String.format("%.2f",n3).toString()+"日元";

text.setText(s3);

}

elseif(btn.getId()==R.id.button4) {

doublen4=Double.parseDouble(edit.getText().toString());

n4=n4*hk;

Strings4="after transform"+String.format("%.2f",n4).toString()+"港币";

text.setText(s4);

}

}

publicvoidconfig(Viewv){

Intentin=newIntent(this,Main2Activity.class);

/*in.putExtra("dol",dol);

in.putExtra("eur",eur);

in.putExtra("jap",jap);

in.putExtra("hk",hk);

*/

//Log.i(TAG,"config: okhhh");

startActivityForResult(in,1);

}

@Override

protectedvoidonActivityResult(intrequestCode,intresultCode,@NullableIntentdata) {

if(requestCode==1&&resultCode==4){

/*Bundle bdl=data.getExtras();

dol=bdl.getDouble("dol",1.0f);

eur=bdl.getDouble("eur",1.0f);

jap=bdl.getDouble("jap",1.0f);

hk=bdl.getDouble("hk",1.0f);

*/

dol=sp.getFloat("dol",0.0f);

eur=sp.getFloat("eur",0.0f);

jap=sp.getFloat("jap",0.0f);

hk=sp.getFloat("hk",0.0f);

Log.i(TAG,"dol:"+dol);

super.onActivityResult(requestCode, resultCode, data);

}

}

@Override

publicbooleanonCreateOptionsMenu(Menumenu) {

//Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.menu_main, menu);

returntrue;

}

@Override

publicbooleanonOptionsItemSelected(MenuItemitem) {

//Handle action bar item clicks here. The action bar will

//automatically handle clicks on the Home/Up button, so long

//as you specify a parent activity in AndroidManifest.xml.

intid=item.getItemId();

//noinspection SimplifiableIfStatement

if(id==R.id.about) {

Toast.makeText(this,"i am about",Toast.LENGTH_SHORT).show();

}

if(id==R.id.settings) {

Toast.makeText(this,"i am settings",Toast.LENGTH_SHORT).show();

}

returntrue;

}

}